Cover-ring for valves.



F. U. BLANGHARD & P. G. DARLING.

-GOVER RING FOR VALVES. 'APPLIOATION FILED MN: 2. 1909.

917,920. Patented Apr. 13,1909.

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FREDERICK C. BLANCHARD AND PHILIP G. DARLING, OF BRIDGEPORT, CONNECTICUT, ASSIGNORS TO THE CONSOLIDATED SAFETY VALVE COMPANY, OF BRIDGEPORT, CON- NECTICUT, A CORPORATION OF CONNECTICUT.

COVER-RING FOR VALVES.

Specification of Letters Patent.

Patented April 13, 1909.

To all whom it may concern:

BLANCHARD and PHILIP G. DARLING, citizens of the United States, and residents of Bridgesectional view of a valve port, in the county of Fairfield and State of Connecticut, have invented new and useful Improvements in Cover-Rings for Valves, oi'

which the following is a specification.

This invention relates to safety valves and cover rings for use in i that type of safety valves wherein the valve is f provided with an upwardly extending cylinmore particularly to drical flange in sliding engagement with the cover containing the valve spring.

In valves of the class described, the cover is made almost invariably of cast iron, and in actual use usually time after it has been placed in service Consequently, it has proved to be an annoying, expensive and even dangerous practice to so construct the valve that its u awardly extending cylindrical flange shall slide directly on the surface of the cover; for the rust upon the latter tends to hold the cylindrical flange of the valve and thus prevent it from opening when the predetermined popping pressure has been reached on the valve. To overcome this difliculty a ring of bronze or similar material has sometimes been placed around the bottom end of the cover in order '30 insure a smooth surface upon which the :zylindrical flange of the valve may slide. The use of said bronze cover ring has not iowever solved the difficulties encountered, )ut on the contrary has proved most unsatisactory in practice because of the difliculties LI1(l annoyances experienced in securirn it 1pon the cover in such manner that it will 1013 work loose and fall down upon the head f the valve thus rendering the valve useless. The ordinary press fit sometimes employed or securing the cover ring, has proved a fail- I [re due to the fact that the bronze expands more than the cast iron oi the cover and herei'ore the ring soon works loose and drops own; and when screws are employed for I his purpose, the continual expansion and I ontraction of the bronze and cast iron 1' auses the screws to work loose, and even reak off. The object of this invention is to obviate iese difiiculties and to that end to provide cover ring which will insure a smooth sur- 1 roe upon which the cylindrical flange of the it known that we, FREDERICK C.

rusts within a very short I valve may slide and which cannot possibly work off from the cover.

Referring to the drawmgs, Figure 1 1s a showing our improved cover ring; and Fig. 2 is a sectional view of the cover ring before it has been secured to the cover.

In the drawings, A is a valve casing provided with a valve seat in which the valve B is seated.

C is the cover mounted upon the casing A and provided with an annular skirt C proj eoting toward the valve B. Within the cover O is the spring D which holds the valve on its seat in the usual manner.

E is the cylindrical flange oi the valve B projecting upward into the steam passage F and, in the embodiment of our invention shown in the drawings, outside of and in sliding engagement with the cover ring G secured to the bottom end of the skirt C of the cover C.

The cover ring is turned straight from bronze or similar material and is provided with a shoulder g and an annular rabbet g.

In assembling the parts of the valve, the cover ring G is pressed onto the skirt C until the shoulder g engages the shoulder c in the skirt C. The annular rabbet g of the ring is then spun down with-a roller tool, or other suitable means, against the inclined surface of the inset or groove in the skirt C, thus clinching the ring securely upon the cover.

By this construction a cover ring is provided which is inexpensive, easily and quickly secured to the cover, and which hen secured cannot be injuriously affected by the expansion and contraction of the opposed bronze and cast iron of which the ring and cover are respectively made.

hat we claim is:

1. In a valve, a valve casing provided with a valve seat, a valve cooperating with said valve seat, a cover, a cover ring clinched upon said cover and said valve having a flange in sliding engagement with said cover ring.

2. In a valve, a valve casing provided with a valve seat, a valve cooperating with said valve seat, a cover provided with an annular inset, a cover ring having an annular rabbet, said annular rabbet clinched within said annular inset and said valve having a flange in sliding engagement with said cover ring.

3. In a valve, a valve casing provided with a valve seat, a valve cooperating with said valve seat, a cover provided with a shoulder and an annular inset having an inclined stirface, a cover ring rovided with a shoulder and an annular ral bet, said shoulder of said ring in engagement with said shoulder of said cover, and said annular rabbet of said ring clinched down upon said inclined surface of said inset, and said valve having a flange in sliding engagement with said cover ring.

4. In a valve, a valve casing provided with a valve seat, a valve cooperating with said valve seat, a cover, a cover ringclinched upon said cover and said valve having a flange outside of and in sliding engagement with said cover ring.

5. In a valve, a valve casing provided with a valve seat, a valve cooperating. with said valve seat, a cover provided with an annular i inset, a cover ring having an annular rabbet, said annular rabbet clinched within said an- I nular inset and said valve having a flange outside of and in sliding engagement with said cover ring.

6. In a valve, a valve casing-provided with a valve seat, a valve cooperating with said valve seat, a cover provided with a shoulder and an annular inset having an inclined surface, a cover-ring provided with a shoulder and an annular rabbet, said shoulder of said ring in engagement with said shoulder of said cover, an said annular rabbet of said ring clinched down upon said inclined surfaceof said inset, and said valve having a flange outside of and in sliding engagement with said cover ring,

Signed by us at Bridgeport, Connecticut, this 30th day of December, 1908.

FREDERICK C. BLANCHARD. PHILIP G. DARLING.

Witnesses:

W. R. CLARKE, J. P. ONEIL. 

